Remove dead code from childIndex optimization

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2401 matching lines @@
         // FIXME: Try to do better than this. Ensure that styleForElement() works for elements that are not in the
         // document tree and figure out when to destroy the computed style for such elements.
         return 0;
 
     ElementRareData& rareData = ensureElementRareData();
     if (!rareData.computedStyle())
         rareData.setComputedStyle(document().styleForElementIgnoringPendingStylesheets(this));
     return pseudoElementSpecifier ? rareData.computedStyle()->getCachedPseudoStyle(pseudoElementSpecifier) : rareData.computedStyle();
 }
 
-void Element::setChildIndex(unsigned index)
-{
-    ElementRareData& rareData = ensureElementRareData();
-    if (RenderStyle* style = renderStyle())
-        style->setUnique();
-    rareData.setChildIndex(index);
-}
-
-unsigned Element::rareDataChildIndex() const
-{
-    ASSERT(hasRareData());
-    return elementRareData()->childIndex();
-}
-
 AtomicString Element::computeInheritedLanguage() const
 {
     const Node* n = this;
     AtomicString value;
     // The language property is inherited, so we iterate over the parents to find the first language.
     do {
         if (n->isElementNode()) {
             if (const ElementData* elementData = toElement(n)->elementData()) {
                 // Spec: xml:lang takes precedence -- http://www.w3.org/TR/xhtml1/#C_7
                 if (const Attribute* attribute = elementData->getAttributeItem(XMLNames::langAttr))
@@ skipping 830 matching lines @@
         || isHTMLObjectElement(*this)
         || isHTMLAppletElement(*this)
         || isHTMLCanvasElement(*this))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore